Chain Tensino

[gobbypunk]

Hi so I havent had my 4ft milling bar out in a long time but had it out for a job today and I know it isnt a sprocket nosed bar but the chain tension was all over the place I would set it then as soon as I introduced the mill into the log it would just go real slack but if I kept going a little it would tighten a tad then finish the cut and rev the saw to clear it switch it off and it would be slack refuel and look again and tight so I dismantled the whole thing rebuilt it all and it didnt make any F###ing difference so any ideas what is going on ? It really really did my head in !!! Looking forward to your thoughts 

     Cheers.  Mark

[pleasant]

Clutch drum bearing disintegrating or collapsing? Or worse case scenario crank bearings failing or crank bent. Remove  bar and cover and see if your clutch drum is running elliptically . Watch the gap between the drum and the body of the saw 

Edited September 30, 2023 by pleasant

[gobbypunk]

Its almost brand new even though I have had it for a few yrs now it dont get used that often its prob only got 20 ish hours of work its done  I always slacken the chain off after use so the crank isnt under preasure ,I am sure I can remember having issues with this 4ft solid nosed bar when I first had the Alaskan but cant remember

[gobbypunk]

Anybody else have any ideas on what the issue with the chain tension might be 

[Stubby]

4 hours ago, gobbypunk said:

Anybody else have any ideas on what the issue with the chain tension might be 

Oiler working ok ?

[spudulike]

What is the saw? Stubby's oiler idea seems a decent one to me. If it is an 880, let us know as their oilers are a bit fragile.

[gobbypunk]

Hi Spud yeah its prob one of the last ones sold before they stopped making them 

[gobbypunk]

I will start it up with the side cover removed and see if  it  comes out

    Thanks. Mark

 

[Dan Maynard]

I can only think of a few things that can slacken the chain - wear (mainly when it's new), heat, or the powerhead rocking forward on the bar slots.

 

If it's getting tight and slack on its own then temperature seems likely , so not oiling properly seems a good candidate but also there is more friction in the plain nosed bar. 

 

Have you got another bar? In be really good to run it with a roller nosed bar even if it's only 36" crosscutting to see all is well doing that.

[gobbypunk]

Yeah like I said when I use the shorter Sugi Bar I dont think I get these issues